Petr Lautrbach <plautrba@xxxxxxxxxx> writes: > `fixfiles -M relabel` temporary bind mounts file systems before > relabeling, but it left the / directory mounted in /tmp/tmp.XXXX when a > user hit CTRL-C. It means that if the user run `fixfiles -M relabel` > again and answered Y to clean out /tmp directory, it would remove all > data from mounted fs. > > This patch changes the location where `fixfiles` mounts fs to /run, uses > private mount namespace via unshare and adds a handler for exit signals > which tries to umount fs mounted by `fixfiles`. > > Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=2125355 > > Signed-off-by: Petr Lautrbach <plautrba@xxxxxxxxxx> > --- Actually, it's v5: v2: - set trap on EXIT instead of SIGINT v3: - use /run instead of /tmp for mountpoints v4: - use mount namespace as suggested by Christian Göttsche <cgzones@xxxxxxxxxxxxxx> v5 - fixed issues reported by Christian Göttsche <cgzones@xxxxxxxxxxxxxx> > > > policycoreutils/scripts/fixfiles | 36 +++++++++++++++++++++++++------- > 1 file changed, 28 insertions(+), 8 deletions(-) > > diff --git a/policycoreutils/scripts/fixfiles b/policycoreutils/scripts/fixfiles > index c72ca0eb9d61..166af6f360a2 100755 > --- a/policycoreutils/scripts/fixfiles > +++ b/policycoreutils/scripts/fixfiles > @@ -207,6 +207,25 @@ rpm -q --qf '[%{FILESTATES} %{FILENAMES}\n]' "$1" | grep '^0 ' | cut -f2- -d ' ' > [ ${PIPESTATUS[0]} != 0 ] && echo "$1 not found" >/dev/stderr > } > > +# unmount tmp bind mount before exit > +umount_TMP_MOUNT() { > + if [ -n "$TMP_MOUNT" ]; then > + umount "${TMP_MOUNT}${m}" || exit 130 > + rm -rf "${TMP_MOUNT}" || echo "Error cleaning up." > + fi > + exit 130 > +} > + > +fix_labels_on_mountpoint() { > + test -z ${TMP_MOUNT+x} && echo "Unable to find temporary directory!" && exit 1 > + mkdir -p "${TMP_MOUNT}${m}" || exit 1 > + mount --bind "${m}" "${TMP_MOUNT}${m}" || exit 1 > + ${SETFILES} ${VERBOSE} ${EXCLUDEDIRS} ${FORCEFLAG} ${THREADS} $* -q ${FC} -r "${TMP_MOUNT}" "${TMP_MOUNT}${m}" > + umount "${TMP_MOUNT}${m}" || exit 1 > + rm -rf "${TMP_MOUNT}" || echo "Error cleaning up." > +} > +export -f fix_labels_on_mountpoint > + > # > # restore > # if called with -n will only check file context > @@ -252,14 +271,15 @@ case "$RESTORE_MODE" in > # we bind mount so we can fix the labels of files that have already been > # mounted over > for m in `echo $FILESYSTEMSRW`; do > - TMP_MOUNT="$(mktemp -d)" > - test -z ${TMP_MOUNT+x} && echo "Unable to find temporary directory!" && exit 1 > - > - mkdir -p "${TMP_MOUNT}${m}" || exit 1 > - mount --bind "${m}" "${TMP_MOUNT}${m}" || exit 1 > - ${SETFILES} ${VERBOSE} ${EXCLUDEDIRS} ${FORCEFLAG} ${THREADS} $* -q ${FC} -r "${TMP_MOUNT}" "${TMP_MOUNT}${m}" > - umount "${TMP_MOUNT}${m}" || exit 1 > - rm -rf "${TMP_MOUNT}" || echo "Error cleaning up." > + TMP_MOUNT="$(mktemp -p /run -d fixfiles.XXXXXXXXXX)" > + export SETFILES VERBOSE EXCLUDEDIRS FORCEFLAG THREADS FC TMP_MOUNT m > + if type unshare &> /dev/null; then > + unshare -m bash -c "fix_labels_on_mountpoint $*" || exit $? > + else > + trap umount_TMP_MOUNT EXIT > + fix_labels_on_mountpoint $* > + trap EXIT > + fi > done; > fi > else > -- > 2.37.3
